# pressure equation in PISO or SIMPLE algorithm

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 January 17, 2012, 05:43 pressure equation in PISO or SIMPLE algorithm #1 Senior Member   Join Date: Jun 2011 Posts: 141 Rep Power: 6 Hi all I have a question about pressure equation in PISO or SIMPLE algorithm please guide me in this problem pressure equation is laplacian(rAU, p) == fvc::div(rAU*UEqn.H()) but in OpenFoam rAU*UEqn.H() is interpolated on cell faces why we do this work ? Best Regards

July 8, 2013, 22:36
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Dongyue Li
Join Date: Jun 2012
Location: Torino, Italy
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Quote:
 Originally Posted by mechy Hi all I have a question about pressure equation in PISO or SIMPLE algorithm please guide me in this problem pressure equation is laplacian(rAU, p) == fvc::div(rAU*UEqn.H()) but in OpenFoam rAU*UEqn.H() is interpolated on cell faces why we do this work ? Best Regards
I think just coz its interpolated on the faces, so it can be expressred by the flux.

 July 22, 2013, 14:17 #3 Member   Haomin Yuan Join Date: Jan 2012 Location: Madison, Wisconsin, USA Posts: 56 Rep Power: 5 I assume you are looking at incompressible flow solver. "rAU*UEqn.H()" here is actually velocity. original equation should be "laplacian(rAU, p) == fvc::div(phi) " phi = fvc::interpolate(U) & mesh.Sf(); U = rAU*UEqn.H() You should look up Prof. Jasak's thesis, he talked about this in detail in his thesis. songwukong likes this.

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